        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
        }
        
        body {
            background-color: #f5f5f5;
            color: #333;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        
        .container {
            max-width: 1600px;
            margin: 0 auto;
            padding: 0 20px;
        }
        /* 顶部导航 */
        .top-nav {
            background-color: white;
            box-shadow: 0 1px 3px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: 700;
            color: #1e88e5;
        }

        .logo-icon {
            margin-right: 10px;
            color: var(--accent);
        }

        .nav-links {
            display: flex;
            gap: 25px;
        }

        .nav-link {
            font-weight: 500;
            color: var(--text);
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.2s;
        }

        .nav-link:hover, .nav-link.active {
            color: var(--primary);
            background-color: rgba(37, 99, 235, 0.1);
        }

        .nav-link.active {
            font-weight: 600;
        }
        .ai-text{
		   font-weight: 500;
		   color:  #4d4dff;
		   padding: 8px 12px;
		   border-radius: 6px;
		   transition: all 0.2s;
		}
		.ai-text:hover,.ai-text.active {
			color: var(--primary);
			background-color: rgba(37, 99,235,0.1);
		}
		.ai-text.active{
			font-weight: 600;
		}
        .search-bar a{
			margin-right: 10px;
			color: black;
			}
        /* 主布局 */
        .main-layout {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 30px;
            margin-top: 30px;
		
        }
        
        /* 轮播图样式 */
        .banner-container {
            position: relative;
            width: 100%;
            height: 400px;
            overflow: hidden;
            margin: 0 auto;
        }
        
        .banner-slides {
            display: flex;
            transition: transform 0.5s ease;
            height: 100%;
        }
        
        .banner-slide {
            min-width: 100%;
            height: 100%;
            background-size: cover;
            background-position: center;
        }
        
        .banner-indicators {
            position: absolute;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            gap: 10px;
        }
        
        .banner-indicator {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: rgba(255,255,255,0.5);
            cursor: pointer;
            transition: all 0.3s;
        }
        
        .banner-indicator.active {
            background: #fff;
            transform: scale(1.2);
        }
        
        .banner-nav {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 40px;
            height: 40px;
            background: rgba(0,0,0,0.3);
            border-radius: 50%;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 24px;
            user-select: none;
        }
        
        .banner-prev {
            left: 20px;
        }
        
        .banner-next {
            right: 20px;
        }
        
        .hero {
            text-align: center;
            padding: 3rem 1rem;
            background-color: white;
            margin-bottom: 2rem;
        }
        
        .hero h1 {
            font-size: 2.5rem;
            margin-bottom: 1rem;
            color: #1e88e5;
        }
        
        .hero p {
            font-size: 1.2rem;
            color: #666;
            max-width: 800px;
            margin: 0 auto 2rem;
        }
        
        .btn {
            display: inline-block;
            padding: 0.8rem 2rem;
            background: #1e88e5;
            color: white;
            border-radius: 30px;
            text-decoration: none;
            font-weight: bold;
            transition: all 0.3s;
        }
        
        .btn:hover {
            background: #0d47a1;
            transform: translateY(-2px);
        }
        
        .courses {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 2rem;
            padding: 0 2rem;
            margin-bottom: 3rem;
        }
        
        .course-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            transition: all 0.3s;
        }
        
        .course-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.2);
        }
        
        .course-img {
            height: 180px;
            background-color: #ddd;
            background-size: cover;
            background-position: center;
        }
        
        .course-info {
            padding: 1.5rem;
        }
        
        .course-info h3 {
            margin-bottom: 0.5rem;
            color: #333;
        }
        
        .course-info p {
            color: #666;
            margin-bottom: 1rem;
            font-size: 0.9rem;
        }
        
        .course-meta {
            display: flex;
            justify-content: space-between;
            color: #888;
            font-size: 0.8rem;
        }
        
        
        @media (max-width: 768px) {
            header {
                flex-direction: column;
                text-align: center;
            }
            
            nav ul {
                margin-top: 1rem;
                flex-wrap: wrap;
                justify-content: center;
            }
            
            nav ul li {
                margin: 0.5rem;
            }
            
            .hero h1 {
                font-size: 2rem;
            }
            
            .banner-container {
                height: 300px;
            }
        }